Relative speed Definition and 56 Threads

Homework Statement A ship cruises forward at Vs = 5 m/s relative to the Water. On deck, a man walks diagonally toward the bow such that his path forms an angle theta = 22 degrees with a line perpendicular to the boat's direction of motion. He walks at Vm = 2 m/s relative to the Boat. Here...

I found some interesting task about tachyons: "Spaceship A sends to spaceship B ( distance between A and B is known) a tachyon, when B recives signal, it sends back it immediately. B flies away from A with velocity v, and the tachyon moves away with the relative velocity V from the...

This thread was snipped and moved from the thread "conflict between electrodynamics and classical relativity" orignally posted by michael879.

Homework Statement speed of man=120m/h angle of bird flight with ground=60 degrees.Homework Equations A man on the ground sees a bird flying at angle of 60 degrees with horizontal.He started running at 120m/hour,is able to stay directly below the bird.What's bird speed? The Attempt at a...

Hey. I've been reading about time dilation and the possibility of time travel, and I've come across a strange concept a few times. Light traveling towards me will be traveling at ~300000000m/s if i am standing still. Apaprently, even if i move towards the light, the speed of the light...

Given coefficient of kinetic friction is zero and the coefficient of restitution is e: A particle of mass m, collides at an angle (theta), with speed v, onto an infinite mass horizontal surface. Collision time is 0.2 seconds. What is the horizontal distance traveled by the particle...